Reference for Pesachim 90:24

א"ל אביי הא וכן לענין טומאה קתני אלא אמר אביי הכי קאמר וכן

Raba said: The halachah is as R'Nathan, even [if it is] one day, and even one hour [before Passover]. AND IT IS LIKEWISE IN RESPECT TO UNCLEANNESS: IF HE OBJECTS TO IT, IT INTERPOSES; BUT IF HE DESIRES ITS PRESERVATION, IT IS LIKE THE KNEADING-TROUGH. How compare: there the matter is dependent on the quantity [of the dough], [whereas] here the matter is dependent on [his] objecting [to it]? Said Rab Judah, Say: But in respect to uncleanness it is not so. Said Abaye to him, But he states, AND IT IS LIKEWISE IN RESPECT TO UNCLEANNESS? Rather, said Abaye, He means it thus: AND IT IS LIKEWISE

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